140740421 has 2 divisors, whose sum is σ = 140740422. Its totient is φ = 140740420.

The previous prime is 140740409. The next prime is 140740447. The reversal of 140740421 is 124047041.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131217025 + 9523396 = 11455^2 + 3086^2 .

It is a cyclic number.

It is not a de Polignac number, because 140740421 - 2⁶ = 140740357 is a prime.

It is a super-2 number, since 2×140740421² = 39615732206514482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140740021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70370210 + 70370211.

It is an arithmetic number, because the mean of its divisors is an integer number (70370211).

Almost surely, 2^140740421 is an apocalyptic number.

It is an amenable number.

140740421 is a deficient number, since it is larger than the sum of its proper divisors (1).

140740421 is an equidigital number, since it uses as much as digits as its factorization.

140740421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 140740421 is about 11863.4068041183. The cubic root of 140740421 is about 520.1631896592.

Adding to 140740421 its reverse (124047041), we get a palindrome (264787462).

The spelling of 140740421 in words is "one hundred forty million, seven hundred forty thousand, four hundred twenty-one".